The oil in the air box probably came from the crankcase breather tube, this is common if the crank case has been over filled. The flywheel has a small metal piece called a key way. It holds the flywheel in place (for timing) these things are cheap and easy to replace. they are often damaged by cheap aftermarket ignitions (rev limiters). Also, check your fuses, I think they are in a black blister pack, can't recall the exact location. If you need more info, go to
www.predatorowners.com they will solve your problem for sure. Don't give up on it yet, they are good machines.